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The Aquarius Stream is a stellar stream located in the Milky Way Galaxy. The Aquarius Stream is one of over a dozen stellar streams in the Milky Way Galaxy. The stream is, at its closest point to Earth, approximately 2000 light years away. It stretches to approximately 30,000 light years away at it's furthest point. Compared to the other stellar streams discovered in the galaxy, the Aquarius stream is the closest one to Earth. The stream got it's name because the observed stars in the stream lie in the direction of the constellation, Aquarius.

It was discovered sometime in late 2010 by RAve, or Radical Velocity Experiment. RAve was using the Sliding Spring Observatory in Australia. The observatory was operated by the Australian Astronomy

The Aquarius Stream is theorized to be the remnants of a dwarf galaxy or globular cluster that was absorbed by the Milky Way over 700 million years ago. This would make the Aquarius stream the youngest stellar stream in our galaxy. Although the stream is relatively young in terms of other stellar constructs, the stars in the Aquarius stream are up to 10 billion years old. When the stream was discovered, the scientists noticed that fifteen stars, out of over 12,00 that RAve was observing, had radically different galactic orbits compared to other stars. The stars were orbiting in what RAve lead study Mary Williams described as "a rose with many pedals". This means that the stars are constantly shifting the orbit they are taking around the galactic center, sometimes moving toward the center and other times moving away. The stars were moving at speeds of up to 15,000 kph. These strange orbits are a sign that the stars did not originate in the Milky Way, and supports the theory that they came from either a small dwarf galaxy or a globular cluster.

Compared to other Stellar streams, the Aquarius stream is unique in that it does not loop around the galactic plane like the other streams in our galaxy. Instead, it seems to be embedded with our galactic plane, making it particularly difficult to observe. As a result, the stars that we can observe are only a small fraction of the total number of stars located in the stream. Large portions of the stream are yet to be discovered, particularly those in the stream's northern extension.